<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>027-HTML5-Video(视频)-使用DOM进行控制</title>
</head>

<body>
    <div style="text-align:center">
        <button onclick="playPause()">播放/暂停</button>
        <button onclick="makeBig()">放大</button>
        <button onclick="makeSmall()">缩小</button>
        <button onclick="makeNormal()">普通</button>
        <br>
        <video id="video1" width="420">
            <source src="mov_bbb.mp4" type="video/mp4">
            <source src="mov_bbb.ogg" type="video/ogg">
            您的浏览器不支持 HTML5 video 标签。
        </video>
    </div>

    <script>
        var myVideo = document.getElementById("video1");

        function playPause() {
            if (myVideo.paused)
                myVideo.play();
            else
                myVideo.pause();
        }

        function makeBig() {
            myVideo.width = 560;
        }

        function makeSmall() {
            myVideo.width = 320;
        }

        function makeNormal() {
            myVideo.width = 420;
        } 
    </script>
</body>

</html>